Bump async
Bump async

Bumps [async](https://github.com/caolan/async) and [async](https://github.com/caolan/async). These dependencies needed to be updated together.

Updates `async` from 2.5.0 to 2.6.4
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.5.0...v2.6.4)

Updates `async` from 2.6.3 to 2.6.4
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.5.0...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
- dependency-name: async
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
kaermorchen/ember-cli-loaders,kaermorchen/ember-cli-loaders